![](https://webarchive.library.unt.edu/eot2008/20081103050140im_/http://www.cancer.gov/images/spacer.gif) |
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(ih-MYOON SIS-tem TAH-leh-runts)
![](https://webarchive.library.unt.edu/eot2008/20081103050140im_/http://www.cancer.gov/images/spacer.gif)
| The failure of the immune system to respond to an antigen that previously caused an immune response. |
Previous Definitions: | immune adjuvant, immune complex hemolytic anemia, immune function, immune response, immune system | Next Definitions: | immune thrombocytopenic purpura, immunity, immunization, immunoassay, immunoassay fecal occult blood test |
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![](https://webarchive.library.unt.edu/eot2008/20081103050140im_/http://www.cancer.gov/images/spacer.gif) |